The graphic novelist Alan Moore granted a rare interview last year that he promised would be his last. Densely bearded and reclusive, with a surly mystic persona that's part Rick Rubin and part Aleister Crowley, Moore has long been canonized for writing books like "Watchmen" and "V for Vendetta" and "The League of Extraordinary Gentlemen" — classics of the medium later adapted into dull movies. He had emerged from...